Tonometer probe



FIG. 1 is an end elevational view of a tonometer probe showing our new design;

FIG. 2 is a side elevational view thereof, with all other side elevational views being identical thereto;

FIG. 3 is an end elevational view thereof, opposite that shown in FIG. 1; and,

FIG. 4 is a perspective view thereof. 

The ornamental design for a tonometer probe, as shown and described. 